I keep getting this error when trying to install the plugin
RedUnited's image
There is a dedicated forum section for Arduino create. You can ask a moderator to move your post by clicking the 'report to moderator' link under your post.
That looks like a windows specific error.
Causes can be either specific or multiple.
Now you are in the correct section might I suggest you read up on a few posts to see what helps.
Most common are a computers security by way of antivirus or user privileges or the computer being used not being the users own computer.